.trans{
  transition: transform .2s ease;
}
.sider-trigger-a{
  width: 53px;
  height: 56px;
  margin: 0;
  color: #e1edef;
  padding-top: 16px;
  display: inline-block;
  vertical-align: top;
  text-align: center;
  &:hover {
    background-color: #0F6CD3;
    color: #fff;
  }
  i{
    .trans;
    vertical-align: top;
  }
  &.collapsed {
    margin-left: 0;
    i{
      transform: rotateZ(90deg);
      .trans;
    }
  }
}
